pjproject: add patch for AST-2021-005

https://downloads.asterisk.org/pub/security/AST-2021-005.html
https://issues.asterisk.org/jira/browse/ASTERISK-29196

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

diff --git a/libs/pjproject/patches/0070-fix-sdp-neg-modify-local-offer.patch b/libs/pjproject/patches/0070-fix-sdp-neg-modify-local-offer.patch
new file mode 100644 (file)
index 0000000..c27a489
--- /dev/null
+++ b/libs/pjproject/patches/0070-fix-sdp-neg-modify-local-offer.patch
@@ -0,0 +1,33 @@
+diff --git a/pjmedia/src/pjmedia/sdp_neg.c b/pjmedia/src/pjmedia/sdp_neg.c
+index 3b85b4273..a14009662 100644
+--- a/pjmedia/src/pjmedia/sdp_neg.c
++++ b/pjmedia/src/pjmedia/sdp_neg.c
+@@ -304,7 +304,6 @@ PJ_DEF(pj_status_t) pjmedia_sdp_neg_modify_local_offer2(
+ {
+     pjmedia_sdp_session *new_offer;
+     pjmedia_sdp_session *old_offer;
+-    char media_used[PJMEDIA_MAX_SDP_MEDIA];
+     unsigned oi; /* old offer media index */
+     pj_status_t status;
+ 
+@@ -323,8 +322,19 @@ PJ_DEF(pj_status_t) pjmedia_sdp_neg_modify_local_offer2(
+     /* Change state to STATE_LOCAL_OFFER */
+     neg->state = PJMEDIA_SDP_NEG_STATE_LOCAL_OFFER;
+ 
++    /* When there is no active local SDP in state PJMEDIA_SDP_NEG_STATE_DONE,
++     * it means that the previous initial SDP nego must have been failed,
++     * so we'll just set the local SDP offer here.
++     */
++    if (!neg->active_local_sdp) {
++      neg->initial_sdp_tmp = NULL;
++      neg->initial_sdp = pjmedia_sdp_session_clone(pool, local);
++      neg->neg_local_sdp = pjmedia_sdp_session_clone(pool, local);
++
++      return PJ_SUCCESS;
++    }
++
+     /* Init vars */
+-    pj_bzero(media_used, sizeof(media_used));
+     old_offer = neg->active_local_sdp;
+     new_offer = pjmedia_sdp_session_clone(pool, local);
+